Paper pulley.



Pdtented June 6, 1916.

l. w. znsom. PAPER PULLEY.

APPLICATION FILED JULY 25, 1914- 1,185,782.

THB COLUMBIA PLANOGRAPH CO. WASHiNOTON, D. C.

I pulley consists of nnrrnn sra'rns PATENT onrrcn.

JOHN W. EDSON, 0F HINGI-IAM CENTER, MASSACHUSETTS.

PAPER PULLEY.

To all whom it may concern Be it known that I, JOHN W. EDSON, a citizen of the United States, residing at I-Iingham Center, in the county of Plymouth and State of Massachusetts, have invented certain new and useful Improvements in Paper Pulleys; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to pulleys, and more particularly to pulleys adapted to be constructed of paper or analogous material.

The object of the invention is to provide a novel and improved construction of pulley which may be conveniently and economically manufactured from paper or analogous material, and which will have the requisite strength and durability to effectively withstand the strains and wear incident to its use as a loose pulley, or for driving moderate loads.

To these ends the invention comprises the features of construction and combinations of parts hereinafter described and referred to in the claims.

The invention will be readily understoodfrom an inspection of the accompanying drawings and the following detailed description of the pulleys illustrated therein.

In the drawings Figures 1 and 2 are trans verse and longitudinal sectional views of a pulley embodying the invention, Fig. 1 being taken on line 2-2 of Fig. 2, and Figs. 3 and 4 are similar views of a modified form of the invention, Fig. 3 being taken on the line 3-3 of Fig. 4.

The pulley shown in Figs. 1 and 2 is especially adapted for use as a loose pulley, or for driving comparatively light loads. As here shown, the periphery or rim of the a cylinder 1, and the supporting web of the pulley consists of a disk 2 fitting within the cylinder. The disk is held centrally within the cylinder by two short cylinders 3 which fit within the cylinder 1 and engage opposite sides of the disk. The disk is provided with a bore 4: which fits the shaft or bearing on which the pulley is to be mounted. In the manufacture of the pulley from paper or analogous material, the cylinders 1 and 3 are cut from paper tubing of the desired diameter and thickness. One of the short cylinders 3 is forced into the outer cylinder 1, the paper disk 2 is then Specification of Letters Patent.

Patented June 6, 1916.

Application filed July as, 1914. Serial No. 853,149.

forced into the outer cylinder and against the end of the cylinder 3, and then the other cylinder ,3 is forced into the outer cylinder and against the opposite side of the disk. In assembling the parts, cement is applied to the engaging surfaces, so that the parts are securelyunited when assembled. The pulley is then treated with a hardening substance which impregnates the paper and hardens and strengthens it. The swelling and drying of the paper when treated with the hardening compound slightly changes the dimensions of the parts, so that they are more firmly united.

The pulley shown in Figs. 3 and 4 is similar in construction, but is better adapted to withstand heavy strains than the construction shown in Figs. 1 and 2, and is especially designed for a driving pulley. In this construction the interior disk forming the sup porting web of the pulley consists of three superimposed sections 5, 6 and 7. The outer sections 5 and 7 are single piece disks, while the center section 6 consists of a plurality of segments, four in the construction shown.

Each of the segments 6 is provided with a tenon 8 adapted to fit within a recess or slot.

formed in the cylinder 1, and thus positively unite the peripheral rim and supporting web of the pulley. In assembling the parts of this pulley, the Segments 6 are first inserted, then the disk sections 5 and 7 are forced into the ends of the cylinder and against opposite sides of the segments. The short cylinders 3 are then forced into the outer cylinder and against the outer sides of the disk sections 5 and 7.. In assembling the parts, cement is applied to the engaging surfaces so that they are securely united, and after the parts are assembled the pulley is treated with a hardening compound which not only hardens and strengthens the pulley, but also serves to more firmly unite the parts.

While it is preferred to employ the specific construction and arrangement'of parts shown and described, it will be understood that this construction and arrangement is not essential except so far as specified in the claims, and may be varied and modified without departing from the broader features of the invention.

Having explained the nature and object of the invention, and described forms of pulleys in which it may be embodied, what is claimed is 1. A pulley comprising an outer composition cylinder, a disk within the cylinder, and two composition cylinders cemented withinthe outer cylinder on opposite sides of the disk.

2. A pulley comprising a paper cylinder, a paper disk within the cylinder, two paper cylinders secured within the outer cylinder on opposite sides of the disk, the assembled parts being hardened.

3. A pulley comprising a paper cylinder, a paper disk within the cylinder, two paper cylinders Within the outer cylinder on opposite sides of the disk, the assembled parts being united by cement and by a compound which hardens the parts.

4:. A pulley comprising an outer cylinder,

a sectional disk within the cylinder including a plurality of segments provided with tenons engaging slots in the cylinder, and two cylinders secured within the outer cylinder on opposite sides of the sectional disk.

5. A pulley comprisng an outer cylinder, a disk within the cylinder comprising a plurality of segments held between two disk sections, tenons on the segments engaging slots in the outer cylinder, and cylinders secured within the outer cylinder on opposite sides of the disk.

JOHN W. EDSON. Witnesses:

A. C. RICHARDSON, GEO. E. S'rnBBINs.

copies or this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C." 

